For those others reading along here, some background on Apple iCloud+ Private Relay:
https://www.apple.com/privacy/docs/iCloud_Private_Relay_Overview_Dec2021.PDF
And for those running networks and servers:
Manage iCloud Private Relay for specific websites, networks, or system settings - Apple Support
If you have detected Private Relay egress addresses you suspect are omitted from the list, contact Apple Support.
More generally, options are to remove or rework the existing geolocation- or blocking-related processing assuming that list can drift from reality, or to assume that Apple will keep that list current as egress ranges are changed or added or removed. I’m sure neither is a preferable choice for whatever you’re doing here, too.
As for various “why?”’s that can exist or can arise here, we don’t know. We’re other users and some are other third-party developers, and not Apple.